US4044672A - Printing machine, in particular an office offset machine with means for pre-curving the master - Google Patents

Printing machine, in particular an office offset machine with means for pre-curving the master Download PDF

Info

Publication number
US4044672A
US4044672A US05/600,448 US60044875A US4044672A US 4044672 A US4044672 A US 4044672A US 60044875 A US60044875 A US 60044875A US 4044672 A US4044672 A US 4044672A
Authority
US
United States
Prior art keywords
master
table part
movable table
roller
cylinder
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
US05/600,448
Other languages
English (en)
Inventor
Theodor Wilhelm Gorr
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Zeuthen and Aagaard AS
Original Assignee
Zeuthen and Aagaard AS
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Zeuthen and Aagaard AS filed Critical Zeuthen and Aagaard AS
Application granted granted Critical
Publication of US4044672A publication Critical patent/US4044672A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Images

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41L—APPARATUS OR DEVICES FOR MANIFOLDING, DUPLICATING OR PRINTING FOR OFFICE OR OTHER COMMERCIAL PURPOSES; ADDRESSING MACHINES OR LIKE SERIES-PRINTING MACHINES
    • B41L29/00—Devices for attaching printing elements or formes to supports
    • B41L29/12—Devices for attaching printing elements or formes to supports for attaching flexible printing formes
    • B41L29/14—Clamping devices
    • B41L29/16—Clamping devices operating automatically during operation of rotary machines to attach the printing formes to the forme cylinders

Definitions

  • This invention relates to a printing machine, in particular an offset office machine comprising a cylinder with gripping members for a master to be wrapped around the cylinder, a table along which the master is advanced to the cylinder during the mounting operation and which comprises means for, by a sliding bending over an edge with a small radius of curvature, giving the master a pre-curvature so that it will more easily wrap itself around the master cylinder, and an operating member for actuating the pre-curving mechanism.
  • Such a mechanism is known in which the master is placed on a joggled stationary table, subsequently to which a transverse roller located above the table is swung down towards the joggle, so that during the continued advance the master is pulled over an edge.
  • the table comprising two parts, a stationary table part and a movable table part which is located closest to the master cylinder and pivotable around an axis parallel to the plane of said table and at right angles to the direction of advance of the master and by an operating member being provided for tilting said movable table part into a position in which its rear edge is located at a short distance from a guiding roller which is mounted rotatably around a stationary shaft in the machine and thereby providing a means for giving the master drawn along the table between said edge and said roller a pre-curvature.
  • this entails the additional advantage that the pivotal part is located below the master, and need only have a relatively small extent in the direction of movement of the master.
  • the printing machine therefore expediently comprises means for pre-adjusting the relative position of said rear edge of the movable part of the table and the guiding roller obtained after the actuation of said operating member and thereby for adjusting the degree of curvature of the master.
  • adjustment means may also serve advantageously in cases where no defects, per se, occur in the printing, but where it is only a question of adapting the pre-curvature in dependence on the type of master used.
  • the fact is that the different types of masters have differing properties, e.g. differing rigidities, depending on the composition and material of the master, and it may be expedient to pay due regard to this by a suitable pre-adjustment.
  • FIG. 1 shows a longitudinal section through those parts of an offset office printing machine essential for understanding the invention
  • FIG. 2 shows said machine seen in perspective and with the cover cut open and some of the parts removed to show the members actuating the movable part of the table guiding the master
  • FIG. 3 shows a longitudinal section through another embodiment of an offset office printing machine
  • FIG. 4 shows a section through a part of the embodiment of FIG. 3.
  • FIG. 2 An embodiment of the machine seen from the outside is shown in FIG. 2 with frame 30 and cover but the invention will in the following be described primarily with reference to the more diagrammatic illustration in FIG. 1 in which one of the parallel sides forming part of the frame is indicated by a line 30.
  • the master cylinder and other parts of the machine are as usual mounted in and between the two sides of the frame and a more detailed description is therefore superfluous in this connection.
  • the circle 1 designates the master cylinder around which a master is to be wrapped.
  • the master is shown in fully drawn lines at 2 and by a thick dotted line at 2'.
  • the master cylinder 1 which is mounted rotatably in the frame 30 of the machine has gripping members 3 which are also shown dotted at 3' in another position in which the gripping members 3 have gripped the end of the advanced master 2, and the master cylinder 1 has turned through a slight angle counter-clockwise.
  • the master 2 to be mounted is supported by a table comprising a stationary table part 4 and a pivotal table part 5, between which an angular guiding and operating part 6 is provided one leg of which projects in under and along one end of the movable table part 5.
  • the angular operating part 6 is mounted on a bracket member 21 and is rotatable around an axis 7, FIG. 2, and carries at least one pressure member 8 which when said angular part 6 is turned clockwise (FIG. 1) around the axis 7 presses against the underside of the pivotal table part 5, so that the said table part 5 is tilted into the position 5' and the angular part 6 into the position 6' shown in dotted lines.
  • the table part 5 turns counter-clockwise around an axis 9, whereby its rear edge, over which the curving operation is to be performed, rises to the vicinity of the periphery of a guiding roller 10 which can turn around an axis 20.
  • the roller 10 keeps the master 2' against the table part 5' during the advance of the master, so that a sliding bending over the rear edge is performed, the rear edge being rounded with a small radius of curvature.
  • the angular guiding part 6 guides the master so as to secure contact with the roller 10 over a suitable angle.
  • the actuation of the table part 5 via the angular operating part 6 is effected from an operating member, e.g. a handle 11, which is shown in its actuated position at 11' and which can turn around an axis 12.
  • the handle 11 is via a lever 13, a link 14 and the bracket member 21 connected to the angular operating part 6.
  • the degree of curvature imparted to the master during the mounting process is determined by the shape of the rear edge of the table 5 and the location of this rear edge in relation to the guiding roller 10. By this location being made adjustable, the degree of curvature may be varied and adapted to the properties of the master used.
  • the adjustability can be brought about by either the roller 10 or the table part 5 or both being made adjustable.
  • the roller 10 may for example be mounted in pivotable brackets which can be fixed in a chosen position, see FIG. 4. In the embodiment shown in FIGS. 1 and 2, the adjustability has been brought about in a particularly simple way by making the pressure member 8 adjustable in relation to the operating part 6.
  • the pressure member may be a screw provided with a notch and screwed into a threaded hole in the operating part 6 and secured in position by means of a nut. Thus the end position of the table in relation to the roller may be adjusted.
  • the angle, through which the operating part 6 is turned when the handle 11 is switched into the position 11', is constant, but by an adjustment of the screw 8 the starting position of the table part 5 is adjusted and thereby the location of the rear edge of the table part 5 in the final position of the table.
  • the degree of curvature becomes the larger the longer the screw 8 is screwed out of the operating part 6 in the direction towards the table part 5.
  • the member 21 carrying the operating part 6 is designed for actuating not only the movable table part 5 into the position 5', but also a moistening roller 15 into the position 15' shown in dotted lines when the handle 11 is switched into the position 11'.
  • the bracket member 21 has a curved surface 16 which presses against a roller 18 located on one branch of a rotatable angular arm 17, in the other branch of which the shaft for one end of the moistening roller 15 is journalled.
  • the moistening unit may comprise two or more rollers and a moistening wick mounted in the frame.
  • the moistening unit and the table may form separate units which are mounted in the machine so as to be easily detachable.
  • a guiding rail 19 which together with the front edge of the table during the mounting of the master forms a narrow guiding slot which opens when the handle 11 is operated to tilt the table part 5 and the master cylinder 1 starts turning counter-clockwise carrying along with it the master placed on the table. In this way it is avoided that the pre-curved master is straightened by being bent in the opposite direction when it leaves the guiding slot.
  • the construction described entails a simplified operational function, during which it is unnecessary to touch the master apart from the moment when the master is placed on the table and slid forwards to the gripping members 3.
  • the effecting of the curving of the master and thereby of a smooth contact against the master cylinder 1 as well as the supply of etching liquid occur fully automatically, and the moistening unit is automatically disengaged when the handle, after the master cylinder has rotated a few turns, is returned to the position 11.
  • the mechanism is completely fool-proof, and the placing operation may be performed blindfolded. The operator does not at all see the members producing the curvature since they are situated under the master.
  • FIGS. 3 and 4 is shown in the same diagrammatic way as the embodiment shown in FIG. 1 and serves to illustrate that the roller 10 may be made pre-adjustable in which case it is not necessary that the pressure member 8 as described in connection with FIG. 1 is pre-adjustable. Only those parts of the mechanism which is necessary to understand the adjustability of the roller 10 are shown.
  • axle of the roller 10 While in FIG. 1 the axle of the roller 10 is mounted stationarily in the frame 30 of the machine, it is in the embodiment in FIGS. 3 and 4 mounted slidable in curved slots 31 in the side plates of the frame 30. At both ends the axle 20 is supported by an adjustment wheel 32 by passing through a curved slot 33 in the adjustment wheel mounted on an axle 34. The slot 33 crosses the slot 31 and is positioned eccentrically in relation to the axle 34.
  • the axle 20 of the roller 10 will move up and down in the slot 31 corresponding to an anticlockwise and a clockwise movement of the wheel, respectively.

Landscapes

  • Bending Of Plates, Rods, And Pipes (AREA)
  • Delivering By Means Of Belts And Rollers (AREA)
  • Manufacture Or Reproduction Of Printing Formes (AREA)
US05/600,448 1974-08-05 1975-07-30 Printing machine, in particular an office offset machine with means for pre-curving the master Expired - Lifetime US4044672A (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DK4169/74 1974-08-05
DK416974AA DK136204B (da) 1974-08-05 1974-08-05 Trykkemaskine, navnlig offset kontormaskine med midler til forkrumning af masteren.

Publications (1)

Publication Number Publication Date
US4044672A true US4044672A (en) 1977-08-30

Family

ID=8130924

Family Applications (1)

Application Number Title Priority Date Filing Date
US05/600,448 Expired - Lifetime US4044672A (en) 1974-08-05 1975-07-30 Printing machine, in particular an office offset machine with means for pre-curving the master

Country Status (5)

Country Link
US (1) US4044672A (US06312121-20011106-C00033.png)
DE (1) DE2534769A1 (US06312121-20011106-C00033.png)
DK (1) DK136204B (US06312121-20011106-C00033.png)
FR (1) FR2281229A1 (US06312121-20011106-C00033.png)
GB (1) GB1512829A (US06312121-20011106-C00033.png)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2800250C2 (de) * 1977-01-07 1984-09-13 Gestetner Manufacturing Ltd., London Offset-Druckmaschine mit einer Plattenaufgabeeinrichtung

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3044771A (en) * 1960-04-18 1962-07-17 Harris Intertype Corp Sheet handling cylinder
US3046009A (en) * 1960-02-09 1962-07-24 Bull Nederland Administratie E Device for conveying and stacking documents bearing registrations
US3431841A (en) * 1964-07-24 1969-03-11 Dick Co Ab Offset duplicating machines with master loading and ejecting mechanisms
US3570397A (en) * 1967-10-13 1971-03-16 Gestetner Ltd Stencil duplicators
US3581658A (en) * 1969-07-28 1971-06-01 Scriptomatic Inc Printing roller assembly for duplicating machines
US3839959A (en) * 1971-11-15 1974-10-08 Roland Offsetmaschf Reciprocating gripper for feeding sheets in rotary printing machines
US3941054A (en) * 1971-10-06 1976-03-02 Heyer Inc. Stencil gripping apparatus for a duplicating machine

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3046009A (en) * 1960-02-09 1962-07-24 Bull Nederland Administratie E Device for conveying and stacking documents bearing registrations
US3044771A (en) * 1960-04-18 1962-07-17 Harris Intertype Corp Sheet handling cylinder
US3431841A (en) * 1964-07-24 1969-03-11 Dick Co Ab Offset duplicating machines with master loading and ejecting mechanisms
US3570397A (en) * 1967-10-13 1971-03-16 Gestetner Ltd Stencil duplicators
US3581658A (en) * 1969-07-28 1971-06-01 Scriptomatic Inc Printing roller assembly for duplicating machines
US3941054A (en) * 1971-10-06 1976-03-02 Heyer Inc. Stencil gripping apparatus for a duplicating machine
US3839959A (en) * 1971-11-15 1974-10-08 Roland Offsetmaschf Reciprocating gripper for feeding sheets in rotary printing machines

Also Published As

Publication number Publication date
FR2281229B1 (US06312121-20011106-C00033.png) 1977-12-16
DK416974A (US06312121-20011106-C00033.png) 1976-02-06
DK136204B (da) 1977-09-05
DK136204C (US06312121-20011106-C00033.png) 1978-02-06
GB1512829A (en) 1978-06-01
DE2534769A1 (de) 1976-06-24
FR2281229A1 (fr) 1976-03-05

Similar Documents

Publication Publication Date Title
US4399729A (en) Apparatus for severing the end of a metal strip wound in a coil
US3985074A (en) Offset printing machines
JPH05500775A (ja) 金属板折り曲げ装置
JPS606562A (ja) 輪転印刷機の折り装置において用いられるブレ−キブラシ
US4696228A (en) Screen process printing machine
US4044672A (en) Printing machine, in particular an office offset machine with means for pre-curving the master
US4637338A (en) Scraping apparatus
CA1271498A (en) Adjustable gripper arm
GB1566184A (en) Sheet feeding apparatus
JP3626564B2 (ja) ラインサーマルプリンタ
JPH03124444A (ja) ドクターブレード装置
US4628810A (en) Printing machine
GB938209A (en) Improvements in or relating to sheet registering apparatus
US2056922A (en) Gripper mechanism for printing presses
US2023734A (en) Folder for printing machines
US5337486A (en) Mechanism for adjusting the skew angle of inclination of a printing plate on its plate cylinder
JP4446534B2 (ja) 断裁機
US3870090A (en) Arrangement in planing machines with feeding mechanism comprising at least two rollers
US2631669A (en) Matrix trimmer
US3497203A (en) Clamping device for paper cutting machines
GB1570064A (en) Bending machine
JPS633714Y2 (US06312121-20011106-C00033.png)
US4420861A (en) Warp beam loading and unloading apparatus for a warping machine
GB2265364A (en) Controlling sheet-delivering grippers
US2587455A (en) Secondary feed and moistening device for hectograph duplicating machines